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From 7e708905c88b8fcf6c6298a02a0cc81109307c87 Mon Sep 17 00:00:00 2001
From: Christian Koenig <christian.koenig@amd.com>
Date: Sun, 3 Sep 2017 15:22:06 +0200
Subject: [PATCH 1811/4131] drm/amdgpu: move taking mmap_sem into
get_user_pages v2
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This didn't helped as intended, just simplify the code.
v2: unlock mmap_sem in the error path as well
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Conflicts:
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
Change-Id: If977df72680ad91fb2a14666199de7c8d9e25ff7
---
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 9 ---------
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 8 +++++++-
2 files changed, 7 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 178339c..1ecc133 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -521,7 +521,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
struct amdgpu_fpriv *fpriv = p->filp->driver_priv;
struct amdgpu_bo_list_entry *e;
struct list_head duplicates;
- bool need_mmap_lock = false;
unsigned i, tries = 10;
int r;
@@ -529,8 +528,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
p->bo_list = amdgpu_bo_list_get(fpriv, cs->in.bo_list_handle);
if (p->bo_list) {
- need_mmap_lock = p->bo_list->first_userptr !=
- p->bo_list->num_entries;
amdgpu_bo_list_get_list(p->bo_list, &p->validated);
if (p->bo_list->first_userptr != p->bo_list->num_entries)
p->mn = amdgpu_mn_get(p->adev, AMDGPU_MN_TYPE_GFX);
@@ -542,9 +539,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
if (p->uf_entry.robj && !p->uf_entry.robj->parent)
list_add(&p->uf_entry.tv.head, &p->validated);
- if (need_mmap_lock)
- down_read(¤t->mm->mmap_sem);
-
while (1) {
struct list_head need_pages;
unsigned i;
@@ -712,9 +706,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
error_free_pages:
- if (need_mmap_lock)
- up_read(¤t->mm->mmap_sem);
-
if (p->bo_list) {
for (i = p->bo_list->first_userptr;
i < p->bo_list->num_entries; ++i) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 0ef0472..8727194 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -689,6 +689,8 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY))
flags |= FOLL_WRITE;
+ down_read(¤t->mm->mmap_sem);
+
if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
/* check that we only use anonymous memory
to prevent problems with writeback */
@@ -696,8 +698,10 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
struct vm_area_struct *vma;
vma = find_vma(mm, gtt->userptr);
- if (!vma || vma->vm_file || vma->vm_end < end)
+ if (!vma || vma->vm_file || vma->vm_end < end) {
+ up_read(¤t->mm->mmap_sem);
return -EPERM;
+ }
}
do {
@@ -724,10 +728,12 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
} while (pinned < ttm->num_pages);
+ up_read(¤t->mm->mmap_sem);
return 0;
release_pages:
release_pages(pages, pinned, 0);
+ up_read(¤t->mm->mmap_sem);
return r;
}
--
2.7.4
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